Soldering terminal for electrical wires



Dec. 29, 1953 H, EPSTEIN 2,664,553

SOLDERING TERMINAL FOR ELECTRICAL WIRES Filed Sept. 14, 1950 Y 23 2z lJ3 10 fa MGE/fm Patented Dec. 29, 1953 l rieure si* '5SOLBERING-TERMINALFORELECTRICAL WIRES This 4-iriveriticn i relatesgenerallyI to soldering terminals and more particularly v.is concernedwith soldering yterminals which are intended to be produced at highspeed, preferably as a staple beingzdriven intda sheetA of. insulatingmaterial, and providingia juncture between a fine wire and a heavy wire.The invention resides in the ter- 'rninal-ahl in the method of producingsame.

in the transformer field; the coils which 'make up the various parts ofthe transformer farevery Ioften Wound of -very Y finel wire havinglimited mechanical strength. -It is customary-and practical to soldeiaheavywire to the fine wire .and provide an anc-hor for the heavy Wire,.whichiwill resist the tensionand--abuse to which the transformer leadsmaybesubjected. This anchor. is usually a terminal member secured tosome part of the transformer to remove all tension from the line wire.The terminal which is shown, described and claimed herein is of thistype, and while useful in the transformer and ballast field, is notnecessarily limited thereto.

One of the important objects of the invention is to provide a solderingterminal of the character described which is extremely simple and highlyeconomical, and which can be applied with great speed for purposes ofquick production.

Another object of the invention is to provide a method oi forming such aterminal from a strip of metal in the saine manner that a staple isformed.

Still a further object of the invention is to provide a terminal formedinitially of a U-shapcd member having one leg longer than the other, andwhich terminal is secured to a base member with the shorter leg cinchedover the top of the base member and the longer leg curled over to form aheavy wire receiving socket, and about which a fine wire may be wrapped.

Other objects lie in the details of the embodiment describedhei'einaiter for purposes or' illustration of the manner in which theinvention 1s practised.

1n the drawings:

Fig. 1 is a perspective View of a strip of metal from which the terminalof the invention is formed.

Fig. 2 is a perspective View of the terminal prior to its being securedto its insulating base, same being formed with legs.

Fig. 3 is a perspective view of the terminal in its iinally iorinedcondition, same being shown without the insulating base for clarity.

Fig. 4 is a perspective View, partially 1n section showingf. af.terminal secured" to' af base and zfhavingiafne:anda coarse wiresoldered thereto.

Fig-i5 is Aa. sectional' view in`1 more Acr lessdia- ;'giamniatic form`showing the manner in which 5 1.a?staple;driver and anvil may be used to`insta-ll luthe;terminal 4upon an insulating base.

Referring now to the drawing, the terminali@ isfshowninstalled inilig. 4and is shown dissociatedfrom'the wires and insulating base `in zgfigr.The terminal i9 consists of a` U-shaped .,stripofometal having a pair oflegs II and l2 of @unequal length and ya connecting bridge I3. The

shorter -legi i. has its free endibent at rightangles :parallel withthebridgev I3 to'form .a clamp lug '45. iii W-hichtig-htly engages theupper surface .of

- the insulating base to 'which the terminal isse- -oured. :Thus infligethere is showniaesheet 'member of` insulating material forming the .base

it having the clamp lug lf3 tightly engaged against the top surface i5thereof with the bridge I3 tightly engaged against the bottom surface I5thereof. Obviously the short leg II extends through the thickness of thebase l5, and

was driven or in any other manner passed through the same while in thecondition shown in Fig. 2, namely, unbent.

As for the longer leg I2, same has its upper end doubled upon itself asshown at I5 but with the bent portion spaced from the body of the leg l2to form therebetween a passageway or socket Il. The leg I2 must alsopass through the insulating base while in unbent condition as shown inFig. 2. The doubled over portion must be formed after the leg I2 iscompletely through the insulating base member I5.

The slot or passageway Il permits a heavy or coarse lead wire I8 to haveits bared end engaged therein and soldered thereto. 'ine large metal tometal contact provides a good adherent for the Solder (not shown) and amechanically good frictional engagement. 'ihe upstandmg leg I2 with itsbent over portion It' enables a few turns of the iine Wire It to betaken upon the same so that when the coarse wireis soldered in place thesolder will flow upon the wrappirigs of the fine wire.

'l'he Iree end of the bent over portion I6 may or may not clear thesurface I5 of the base member It', although it is preferred that therebe a space so that the fine wire will be wrapped wholly upon the unbentportion oi' the leg l2.

'lne teriiiinais may be iorined in any or a number or' ways, although 1tis preferred that they be handled as staples and installed by means of astapling machine.

The base member l may be pre-perforated to receive the terminals in thecondition shownV in Fig. 2, and then the legs Il and l2 may be bent byany appropriate tools. In such case, the terminals may be furnished inthe condition shown in Fig. 2 or Fig. 1. If in the form of Fig. 1,namely as a strip cut to size, some simple forming jog may be used tobend the same to the shape desired.

As stated herein it is preferred that the terminals be installed much asstaples. The art is replete with stapling machines which carry coils ofwire or metal strip, and which, When operated, form the staple, sever itfrom the coil, drive it into the material, and bend the legs to cinchthe same. it is contemplated that this terminal be formed in thismanner. The terminal is rst formed in the stapling machine with the legsunbent as shown in Figs. 2 and 5. If desired, when the legs are severedfrom the principal coil, they may be provided with sharp ends as shownat 28.

The staple driver is indicated schematically at 2i and the anvil orforming die at 22. The points of the terminal l are driven through thebase member. Ehe point of the long leg I2 enters the curling cavity 23and follows a path indicated by the arro v shown in Fig. 5 in saidcavity. This will result in the formation i5 which will provide thedesired socket Il. Simultaneously the short leg l2 enters the cinchingcavity 2li, and following the path of the arrow illustrated therein, itis lformed into a lug lf2 overlying the top surface l5' and clamping theterminal l@ thereto.

It is believed that the invention has been sufnciently described Withoutany necessity for further details and it is to be understood that manyvariations are possible Without departing from the spirit of theinvention as defined by the appended claim.

What is claimed and desired to be secured by Letters Patent of theUnited States is:

A soldering terminal for joining a coarse wire and a fine Wire, saidterminal being secured to a sheet member of insulating material andcompricing a staple-like, substantially U-shaped, iiat strip member ofuniform width having its bridging portion engaged against one surface ofthe sheet member in face to face contact therewith, the legs of saidstrip member being of unequal lengths, the Yshorter leg having its freeend bent parallel to the bridging portion and engaged against theopposite surface of the sheet member, the longer leg extendingperpendicular to the sheet and having its ree end formed with a reversecurved bend of at least thereby forming a socket spaced from the saidopposite surface adapted to receive said coarse wire, said longer leghaving a straight portion between the socket and the said second surfaceof sufficient length to permit the Wrapping of ne Wire about saidstraight portion.

HIRSCH EPSTEIN.

References Cited in the le of this patent UNITED STATES PATENTS NumberName Date 1,122,290 Mack Dec. 29, 1914 1,815,212 Ogg July 21, 19312,293,596 Del Camp Aug. 18, 1942 2,435,756 Larkin Feb. 24, 19482,462,127 Pheazey Feb. 22, 1949 2,464,405 Knauf Mar. 15, 1949 2,515,105Weisberg July 11, 1950 2,517,848 Del Camp Aug. 8, 1950

